The factional torque for square thread at the mean radius r while rais

1.	The factional torque for square thread at the mean radius r while raising load W is given by
A.	T = W.r tan(φ - α)
B.	T = W.r tan(φ + α)
C.	T = W.r tan α
D.	T = W.r tan φ
Answer» C. T = W.r tan α

Discussion

No Comment Found

Related MCQs

The secondary unbalanced force due to inertia of reciprocating parts in a reciprocating engine is given by (where m = Mass of reciprocating parts, ω = Angular speed of crank, r = Radius of crank, θ = Angle of inclination of crank with the line of stroke, and n = Ratio of the lengm of connecting rod to radius of crank)
In a differential band brake as shown in the below figure, the drum rotates anticlockwise and the greater tension T1 acts at A and smaller tension T2 at B. Length OA is greater than length OB. In order to apply the brake, the force P at C should
In a Hartnell governor, the lift of the sleeve is given by (where r1 and r2 = Max. and min. radii of rotation, x = Length of ball arm of the lever, and y = Length of sleeve arm of the lever)
The acceleration of piston in a reciprocating steam engine is given by (where ω = Angular velocity of crank, r = Radius of crank pin circle, θ = Angle turned by crank from inner dead centre, and n = Ratio of length of connecting rod to the radius of crank)
Two pulleys of radii r1 and r2 and at distance x apart are connected by means of an open belt drive. The length of the belt is
The frictional torque transmitted in a flat pivot bearing, considering uniform pressure, is (where μ = Coefficient of friction, W = Load over the bearing, and R = Radius of bearing surface)
A point B on a rigid link AB moves with respect to A with angular velocity ω rad/s. The angular acceleration of the link AB is (where and = Radial and tangential components of the acceleration of B with respect to A)
The two links OA and OB are connected by a pin joint at O. If the link OA turns with angular velocity ω1 rad/s in the clockwise direction and the link OB turns with angular velocity ω2 rad/s in the anti-clockwise direction, then the rubbing velocity at the pin joint O is (where r = Radius of the pin at O)
When a particle moves round the circumference of a circle of radius r with ω rad/s, then its maximum acceleration is ω2r.
In a Hartnell governor, the stiffness of the spring is given by (where S1 and S2 = Spring forces exerted on the sleeve at max. and min. radii of rotation, and h = Compression of the spring)

The factional torque for square thread at the mean radius r while raising load W is given by

Discussion

No Comment Found

Related MCQs

Reply to Comment